How to write code in Address 0x0008? (Interrupt Vector)

[electroRF]

Hi

I'm using PIC18F4520, with MPLAB IDE, XC8 Compiler.

I wanna write code for ISR, at address 0x0008.

How do I do that?

Thank you.

 

[Ian Rogers]

If you write..

void interrupt ISR()
   {
    // High by default
   }

Or low priority

void low_priority interrupt ISR()
   {
    // Low as required..
   }

I haven't used / tested this... This is from the manual..

 

[Ian Rogers]

A rewrite.... I hate giving code untested,,,, So I wrote this to test

#include<xc.h>
volatile int x;

void interrupt low_priority ISRL()
    {
    x = 2;
    INT1IF = 0;  // cancel button 1 press
    }
  
void interrupt ISRH()
    {
    x = 1;
    INT2IF = 0;  // cancel button 2 press
    }
  
void main(void)
    {
    IPEN = 1;   // Interrupt prority set,,,
    ADCON1 = 0xF;  // PORTB ADC off
    INTCON3 = 0x98;  // set interrupt priority to INT1 and INT2
    INTCON = 0xC0;    // GIEH and GIEL set
    while(1)
        {
        }  
    }

This DOES work...

 

[electroRF]

Thank you!
I'll try it out in my code and will update

 

[misterT]

Thank you!
I'll try it out in my code and will update

Have you read the documentation? I know it is over 500 pages, but you do not have to read all of it. The part about interrupts is only 5 pages [189, 194]. https://ww1.microchip.com/downloads/en/DeviceDoc/52053B.pdf